The answer is client-side encryption with keys stored on-premises. This solution ensures the organization retains exclusive control over the encryption keys, satisfying PCI DSS and local banking law requirements that mandate the data owner—not the cloud provider—manage key access. On the CISSP exam, this scenario tests your understanding of the cloud shared responsibility model and the distinction between provider-managed key services (like KMS) and client-side key management. A common trap is assuming the cloud provider’s encryption-at-rest with AES-256 is sufficient for compliance, but regulatory frameworks often demand that the customer hold the keys outside the provider’s trust boundary. Remember the mnemonic “C.O.P.E.”—Client-side, On-premises keys, Provider has no access, Exclusive control—to quickly recall that compliance-driven scenarios require keeping keys out of the cloud provider’s hands.
CISSP Security and Risk Management Practice Question
This CISSP practice question tests your understanding of security and risk management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A financial institution is migrating its customer data to a cloud environment. The cloud provider offers encryption at rest and in transit using AES-256 and TLS 1.2+. The compliance team requires that the organization maintain full control of encryption keys to meet regulatory obligations such as PCI DSS and local banking laws. The data is highly sensitive and includes personally identifiable information (PII). Which solution should the security architect recommend?
Implement client-side encryption with keys stored on-premises
Client-side encryption ensures the provider cannot access plaintext data, and keys remain under the organization's control.
B
Use tokenization instead of encryption
Why wrong: Tokenization replaces sensitive data with tokens; may not preserve functionality for all data types and still requires secure token vault management.
C
Use the cloud provider's default encryption with their key management service
Why wrong: Key management is shared with the provider, failing the 'full control' requirement.
D
Accept the provider's encryption without additional controls
Why wrong: No key control; does not meet compliance requirements.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement client-side encryption with keys stored on-premises
Client-side encryption with keys stored on-premises ensures the organization retains exclusive control over encryption keys. Relying on cloud provider's encryption with KMS gives key management to the provider, which may not satisfy compliance. Accepting provider encryption without additional controls surrenders control. Tokenization can protect data but removes original format, which may not be acceptable for all uses.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Implement client-side encryption with keys stored on-premises
Why this is correct
Client-side encryption ensures the provider cannot access plaintext data, and keys remain under the organization's control.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use tokenization instead of encryption
Why it's wrong here
Tokenization replaces sensitive data with tokens; may not preserve functionality for all data types and still requires secure token vault management.
✗
Use the cloud provider's default encryption with their key management service
Why it's wrong here
Key management is shared with the provider, failing the 'full control' requirement.
✗
Accept the provider's encryption without additional controls
Why it's wrong here
No key control; does not meet compliance requirements.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Identify which CISSP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Security and Risk Management — This question tests Security and Risk Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Implement client-side encryption with keys stored on-premises — Client-side encryption with keys stored on-premises ensures the organization retains exclusive control over encryption keys. Relying on cloud provider's encryption with KMS gives key management to the provider, which may not satisfy compliance. Accepting provider encryption without additional controls surrenders control. Tokenization can protect data but removes original format, which may not be acceptable for all uses.
What should I do if I get this CISSP question wrong?
Identify which CISSP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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